ChrisAttebery
Well-Known Member
- Joined
- Feb 15, 2014
- Messages
- 2,454
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Before I got out of rocketry 13 years ago I had designed a Mk82 "Snake Eye" bomb type rocket with petal type air brakes. I started a thread on Rocketry Online about it but never built mine. Someone there had actually built one about BT60 sized. Your thread and the one on the umbrella chute got me thinking about it again. Over the weekend we attended our first launch with the kids at Moffett field. Afterwards we were able to take a tour of a P3 Orion and they had the sonobouys on display. They also use a petal type air brakes. I explained how it worked to the kids and told them about my rocket idea and it got the creative juices flowing again. I've got it all drawn up in Open Rocket. I just need to order the parts.
Here's a picture of what I am thinking about:
This is what I came up with. The motor mount tube will be the main structure of the rocket. I'll use LOC or some other heavyweight 24mm tube. The outer shell will be made from BT-80 and I'll use a long BT-80 nose cone. The front 6" of the body tube will be attached to the nose cone. The forward section of the rocket will slide front to back on a coupler that is attached to the motor mount. The rear 12" will be cut into 4 sections and then a fin will be glued to the edge of each section. These sections will be hinged into a thick balsa centering ring at the rear. The front edges will have a short segment of coupler glued to them. In flight these segments will be captured inside the back edge of the front section of tubing. When the ejection charge goes off it will push the forward section forward and the rear segments will be free to open up. The four segments will be kept from opening too far by lengths of kevlar twine.
Here's a picture of what I am thinking about:
This is what I came up with. The motor mount tube will be the main structure of the rocket. I'll use LOC or some other heavyweight 24mm tube. The outer shell will be made from BT-80 and I'll use a long BT-80 nose cone. The front 6" of the body tube will be attached to the nose cone. The forward section of the rocket will slide front to back on a coupler that is attached to the motor mount. The rear 12" will be cut into 4 sections and then a fin will be glued to the edge of each section. These sections will be hinged into a thick balsa centering ring at the rear. The front edges will have a short segment of coupler glued to them. In flight these segments will be captured inside the back edge of the front section of tubing. When the ejection charge goes off it will push the forward section forward and the rear segments will be free to open up. The four segments will be kept from opening too far by lengths of kevlar twine.